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“A dugong's tail is crescent-shaped like a dolphin's, while a manatee's is paddle-shaped.”
The dugong is a seagrass-grazing marine mammal found along warm coasts from East Africa to the western Pacific. Its slow reproduction and dependence on healthy seagrass beds leave many populations vulnerable to habitat loss and fishing activity.
Dugong dugonSireniaDugongidae
Browse photographs of dugong across habitat, behavior, anatomy, and life stages.
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Core article
A closer look at habitat, diet, behavior, reproduction, and conservation.
Gliding slowly through sunlit lagoons and seagrass meadows of the tropical Indo-Pacific, the dugong (Dugong dugon) is a gentle coastal mammal built for underwater grazing. Fully marine and air-breathing, it shares an ancient sirenian ancestry with manatees while remaining the only living member of the family Dugongidae. With a downturned snout, bristly lips, and a dolphin-like crescent fluke, the dugong spends much of its life quietly shaping seagrass ecosystems—one rooted mouthful at a time.
Dugongs belong to the order Sirenia, the living "sea cows." Within that order, manatees form the family Trichechidae, while dugongs alone represent the family Dugongidae. Their closest famous relative, Steller's sea cow, once lived in the North Pacific but was hunted to extinction in the 1700s. Despite looking somewhat whale-like, dugongs are not cetaceans; evolutionary studies place them nearer elephants and hyraxes, a reminder that fully aquatic mammals have arisen more than once. Fossils show dugong relatives once occupied a wider ocean world, leaving today's Dugong dugon as a single species stretched thinly across warm Indo-Pacific coasts.
An adult dugong usually measures about 8 to 10 feet long and may weigh 500 to more than 1,000 pounds. The body is torpedo-shaped, with paddle-like foreflippers and no hind limbs. The most reliable field difference from a manatee is the tail: dugongs have a notched, horizontal fluke, while manatees have a rounded paddle. The dugong's muzzle is strongly downturned and covered with sensitive bristles that locate plants in murky water. Dense, heavy bones act as ballast, helping the animal stay near the seabed while grazing. Nostrils sit on top of the snout and seal shut underwater; the animal must surface regularly to breathe.
Dugongs inhabit shallow tropical and subtropical coast waters of the Indo-Pacific. Their range runs from East Africa and the Red Sea eastward through South and Southeast Asia to northern Australia, New Caledonia, and Vanuatu. They prefer calm bays, reef lagoons, and wide seagrass flats usually less than about 30 feet deep. Unlike many manatees, dugongs do not move into freshwater rivers; they remain tied to coastal saltwater plant beds. Australia supports some of the largest remaining populations, while many island and Asian stocks are now small and scattered.
As strict herbivores, dugongs specialize on seagrass. They crop leafy shoots but often dig into the sediment for nutritious roots and rhizomes, leaving distinct grazing trails across the meadow. Feeding bouts can continue for hours each day because plant food is bulky and low in calories. Soft, mobile lips draw vegetation into the mouth; wear from grit and plant fiber is so intense that dugongs, like manatees, continuously replace their molar-like cheek teeth. Healthy seagrass meadows are therefore not just dinner plates—they are the entire foundation of dugong survival.
Dugongs are typically solitary or travel in loose mother-calf pairs, though groups may gather where food is rich. They communicate with soft chirps, squeaks, and quiet body contact that help calves keep pace in cloudy water. Most of the day is spent feeding, traveling slowly between meadows, and resting near the surface or just below it. Cruising speeds are modest, but a startled dugong can accelerate in a short burst. Mothers are protective teachers: calves follow them for well over a year while learning where the safest channels and richest plant beds lie.
Dugongs reproduce slowly. Females often mature in their teens and usually give birth to a single calf after about 13 to 15 months of gestation. Birth happens underwater; the newborn rises at once for air and then nurses on rich milk. The calf may stay dependent for more than a year, riding in the mother's slipstream and practicing grazing. If it survives early risks from boats, nets, and sharks, a dugong may live for decades—sometimes approaching 70 years. That long life, paired with rare births, means populations recover only slowly after decline.
(Population and conservation trend data sourced from the IUCN Red List of Threatened Species)
The dugong is listed as Vulnerable, and many local populations continue to decline. The greatest pressure is loss and damage of seagrass meadows from coastal development, dredging, polluted runoff, and destructive fishing. Boats strike dugongs that must surface to breathe, and fishing nets can entangle them. In some regions, hunting still occurs. Because dugongs depend so tightly on coastal plants, protecting and restoring seagrass—and reducing boat and net casualties—is the clearest path to keeping these quiet grazers in Indo-Pacific seas.
A dugong's tail is crescent-shaped like a dolphin's, while a manatee's is paddle-shaped.
Dugongs are the only living members of the family Dugongidae; Steller's sea cow was a larger relative hunted to extinction.
An adult can eat tens of pounds of seagrass roots and leaves in a single day.
Dugongs never leave saltwater—they stay in coastal seas instead of rivers like many manatees.
Sailors' mermaid stories may have been inspired by distant glimpses of dugongs and manatees.
Mother dugongs and calves chatter with soft chirps and squeaks to stay together.
Select a question to reveal the answer.
A dugong is a large plant-eating marine mammal that lives in warm coastal seas. It is related to manatees and more distant elephants, and it breathes air even though it lives in the ocean.
Dugongs have a notched, whale-like fluke and live only in saltwater. Manatees have rounded paddle tails and often use rivers and estuaries as well as coasts.
Dugongs are herbivores that graze on seagrass. They often dig into the seabed to pull up roots and rhizomes as well as leafy shoots.
They live in shallow tropical and subtropical coastal waters of the Indo-Pacific, from East Africa and the Red Sea east to northern Australia and nearby islands.
Most adults are about 8 to 10 feet long and can weigh 500 to more than 1,000 pounds.
A baby dugong is called a calf. It is born underwater and rises quickly to take its first breath.
Dugongs are listed as Vulnerable. Seagrass loss, boat strikes, fishing-net entanglement, and hunting threaten many local populations.
Dugongs usually surface every few minutes while active, but a resting animal can stay underwater longer before needing air.
By grazing seagrass meadows, dugongs help keep underwater plant beds healthy and serve as a warning sign when coastal habitats are in trouble.
No. Manatees live mainly in the Atlantic, Caribbean, and Amazon regions, while dugongs live in the Indo-Pacific. They are cousins but do not share the same oceans.
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